[PATCH 5.15 129/244] netfilter: nf_tables: NFTA_SET_ELEM_KEY_END requires concat and interval flags

Greg Kroah-Hartman
2022-08-23T10:12:24Z

From: Pablo Neira Ayuso <pablo@netfilter.org>

commit 88cccd908d51397f9754f89a937cd13fa59dee37 upstream.

If the NFT_SET_CONCAT|NFT_SET_INTERVAL flags are set on, then the
netlink attribute NFTA_SET_ELEM_KEY_END must be specified. Otherwise,
NFTA_SET_ELEM_KEY_END should not be present.

For catch-all element, NFTA_SET_ELEM_KEY_END should not be present.
The NFT_SET_ELEM_INTERVAL_END is never used with this set flags
combination.

Fixes: 7b225d0b5c6d ("netfilter: nf_tables: add NFTA_SET_ELEM_KEY_END attribute")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/netfilter/nf_tables_api.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)

--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -5711,6 +5711,24 @@ static void nft_setelem_remove(const str
set->ops->remove(net, set, elem);
}

+static bool nft_setelem_valid_key_end(const struct nft_set *set,
+ struct nlattr **nla, u32 flags)
+{
+ if ((set->flags & (NFT_SET_CONCAT | NFT_SET_INTERVAL)) ==
+ (NFT_SET_CONCAT | NFT_SET_INTERVAL)) {
+ if (flags & NFT_SET_ELEM_INTERVAL_END)
+ return false;
+ if (!nla[NFTA_SET_ELEM_KEY_END] &&
+ !(flags & NFT_SET_ELEM_CATCHALL))
+ return false;
+ } else {
+ if (nla[NFTA_SET_ELEM_KEY_END])
+ return false;
+ }
+
+ return true;
+}
+
static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set,
const struct nlattr *attr, u32 nlmsg_flags)
{
@@ -5770,6 +5788,9 @@ static int nft_add_set_elem(struct nft_c
return -EINVAL;
}

+ if (!nft_setelem_valid_key_end(set, nla, flags))
+ return -EINVAL;
+
if ((flags & NFT_SET_ELEM_INTERVAL_END) &&
(nla[NFTA_SET_ELEM_DATA] ||
nla[NFTA_SET_ELEM_OBJREF] ||
@@ -6192,6 +6213,9 @@ static int nft_del_setelem(struct nft_ct
if (!nla[NFTA_SET_ELEM_KEY] && !(flags & NFT_SET_ELEM_CATCHALL))
return -EINVAL;

+ if (!nft_setelem_valid_key_end(set, nla, flags))
+ return -EINVAL;
+
nft_set_ext_prepare(&tmpl);

if (flags != 0) {